Generalisation has been focus of anti-spoofing research since the inception of the ASVspoof initiative. It is well known that even top-performing systems can struggle to detect the full range of spoofing attacks [1]}. There is hence interest in minimising not just pooled performance, but also that for the so-called worst case scenario which, for the ASVspoof 2019 LA database, is generally the infamous A17 attack.
